Hi Anthony and welcome to the forum.
The running gear is the easy part, but the non-standard scale will be difficult for deck fittings and so on, as you say, unless you make them yourself. This is the question really…how much do you want to do in the way of detail, and is home-made or shop bought the way you would sooner go?
Are there other plans at a more commercial scale, or even a hull available (with plans) to assist this?
THEN you can worry about the running gear! (I would not worry about that, it is relatively easy) There are several lifeboat gurus out there who will no doubt give you much better advice.
Ashley